The EDM festival UNITE With Tomorrowland evacuated the grounds in Barcelona, Spain, after a stage caught fire Saturday night. Nearly 22,000 attendees were evacuated from the city’s Parc de Can Zam with no serious injuries reported, though many were treated for anxiety, according to the Spanish site El Periodico.

Steve Aoki was slated to headline the one-day event, which was scheduled to go until 3 a.m. Organizers posted a statement on the festival’s Facebook page, citing “a technical malfunction” as the reason behind the fire. They added, “Authorities will follow up and continue the investigation with the local Spanish organizer of UNITE.” Pitchfork has reached out to representatives of Tomorrowland for additional comment.